Effects of Data Quantization and Display Contrast on Detection in Intensity Modulated Displays

摘要

Subjective studies of visual perception of targets in homogeneous noise backgrounds reveal that neither the number of quantized luminance levels nor the display contrast, i.e., the ratio of maximum to minimum values of luminance available in the display, has an appreciable effect on target visibility. Increasing the number of quantized levels reduces the coarseness of the background; however, the brightness contrast of the target is reduced simultaneously in such fashion as to maintain the ratio of target contrast to background fluctuation nearly constant. The experimental results also demonstrate a large variance of visibility threshold among the several observers employed that cannot be attributed to experience or training. As is true of electronic and mechanical signal processing devices, certain human processors are much more effective than others for a particular detection task. (Author)